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Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2022 | Dec. 31, 2021 | Dec. 25, 2020
Defined Contribution Plan |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% |  |
Company contribution rate for employees not covered by DBP | 2.00% |  |
Company contributions to 401K | $ 11,000 | $ 10,000 | $ 8,700
Defined Benefit Plan Disclosure [Line Items] |  |  |
Highest earnings years | 5 years |  |
Years preceding retirement | 10 years |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 20,000 | 20,000 |
Accumulated benefit obligation for all defined benefit plans | 297,000 | 388,000 |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | $ 1,000 | 12,000 | 5,000
Pension Plan - Blue Plan [Member] | Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 53.00% |  |
Pension Plan - Blue Plan [Member] | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 42.00% |  |
Pension Plan - Blue Plan [Member] | Real Estate and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 5.00% |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | $ 0 | 64,886 |
Settlement loss (gain) | $ 0 | 12,285 | 0
Investments at Net Asset Value, Redemption Frequency | daily |  |
Investments at Net Asset Value, Unfunded Commitments | $ 2,300 | 2,400 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 22,756 | 22,493 |
Expected company contributions to retirement plans next year | 1,900 |  |
Pension Benefits | Pension Plan - Blue and Gray Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement |  | 63,000 |
Settlement loss (gain) |  | (12,000) |
Postretirement Medical Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 0 | 0 |
Settlement loss (gain) | 0 | 0 | $ 0
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 1,503 | $ 1,447 |
Retirement medical plan limit on annual increase in company cost | 3.00% |  |
Expected company contributions to retirement plans next year | $ 1,800 |  |
Assumed health care trend rates |  |  |
Health care cost trend rate assumed for next year | 8.50% |  |
Ultimate health care cost trend rate | 4.50% |  |
Year that rate reaches ultimate trend rate | 2038 |  |
Minimum | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Net Asset Value, Redemption Notice Period | 10 days |  |
Maximum | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Net Asset Value, Redemption Notice Period | 60 days |  |

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- Definition For those employees who are not covered by a defined benefit plan, the percentage of their gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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